Anonymous wrote:I think I would start a conversation with something like, "You seem really unhappy a lot of the time. I wanted to check in and see if that's really the case, or if I'm just misinterpreting. I know being with the kids all day is a lot of work, but we need to talk about it if it's all wearing you down."
Then, I would hope she either says something constructive that leads to a reasonable conversation, or takes the hint and adjusts her attitude.
Another approach might be to interrupt one of these complaints by saying, "I know it's a boring job sometimes, but we are so glad you are here for them. I'm starting to feel like you're burnt out and unhappy, though. Do you have any ideas about what we can do about that? For your sake and the children's sake, I don't want you to spend your whole day being miserable."
Then she either realizes she needs to stop venting to you, or, again, hopefully says something reasonable.
This is exactly what I'd recommend also. If things don't improve (she doesn't get the hint), I'd be even more direct with the next conversation. "Jane, I'm still concerned about all of the negative comments you're making. You seem very unhappy in the job and that's not good for you, us, or most importantly - the kids. Is there something we can do to help you be happier in the position, or do you think this job is just no longer something you want?"